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(No Model.) 2 Sheets-8heet 1.

. A. F. GILLET. PARALLEL RULER.

No. 496,825. Patented May 2, 1893.

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(No Model.) 2 Sheets- 8116615 2.

A. P. GILLET. PARALLEL RULE-R.

No.'496,825. Patented May 2, 1893.

WITNESSES: INVENTOR 02164 f afisa ds 1 017%: Y

UNITED STATES ?ATENT OFFICE.

ALEXIS F. GILLET, OF KEARNEY, NEBRASKA, ASSIGNQR OF TWO-THIRDS TO GEORGEW. WVHITEAKER AND JAMES D. WHITEAKER, OF SAME PLACE.

PARALLEL RU LER.

SPECIFICATION forming part of Letters Patent No. 496,825, dated May 2,1893.

Application filed June 18, 1892. Serial No 437,219- (No model.) I

To all whom it may concern.-

Be it known that I, ALEXIS F. GILLET, of Kearney, in the county ofBuffalo and State of Nebraska,have invented a new and usefulImprovements in Drafting-Instruments, of which the following is aspecification.

My invention is an improvement in drafting instruments and has for anobject to provide a simple novel construction by which to aid in settingthe ruling edge for drawing close parallel lines as in representingcross sections, screw threads, &c.

The invention consists in peculiar constructions and combinations ofparts hereinafter described and pointed out in the claims.

In the drawings-Figure 1 is a plan view of my improvement as in use.Fig. 2 is a partial end view showing the wheel and its click or pawl.Fig. 3 is a cross section on about line 3-3 Fig. 1. Fig. 4 is a sectionon about line 4-4 of Fig. 3. Fig. 5 is a detail view of the angleclamping block with its screw shank and Fig. 6 shows the open nut indetail.

In carrying out my invention I provide a base support or rule Awhich isshown as a T square but while the invention is especially designed foruse as a T square and it is preferred to employ it in such arrangementor application it is manifest that I do not desire to be limited in thebroad features of my invention to such arrangement or use.

The shaft 13 is arranged longitudinally upon the support or rule A andis journaled in bearings C so it may be turned. This shaft is threadedand is provided with a ratchet like wheel D by which it may be turnedand which is engaged by a click or pawl 11 to regulate the turning ofthe shaft in a step by step manner as desired. In the construction shownthe wheel has sixteen teeth and the threads of the shaft are eight tothe inch so that it will take one hundred and twenty-eight singlemovements or steps of the wheel to move a part engaged with the screwone inch or each single movement of the wheel will move such part oneone hundred and twenty-eighth of an inch. This ratchet wheel and thepawl or click form in connection with the shaft a step by step mechanismfor feeding the angle holder presently described along the base supportor rule.

The angle holder E is adapted to hold or clamp the angle and is movablealong the base support or rule. In the construction shown the holder isformed with a main plate 1 formed to slide along the support or rule andprovided with a guide portion e embracing the shaft but not engaging thethreads thereof so that the main plate may slide along the shaft andrule or support. The holder also has a nut like portion 3 which ispreferably in the nature of a segmental nut section formed at 4 toengage the screw shaft and being movable into and out of such engagementpreferably by hinging the section 3 at 5 so it may be set out ofengagement with the shaft. ate the nut section into engagement with theshaft and opposing handles 7 and 8 facilitate its adjustment clear ofthe shaft. When the nut is clear of the shaft the holder with the anglemay be moved freely along the support or rule. The plate 1 is providedwith an arm 9 projecting beyond the edge of the support or rule andhaving a slot 10 formed through it.

The clamp section or arm 11 of the holder A spring 6 is arranged toactuis movable transversely of the plate 1 and actuated by a spring 12which serves to retract the clamp. This clamp has an arm 13 extendedover the arm 9 and provided with a slot 14 in register with and narrowerthan the slot 10. .The clamp block 15 is formed at one side with a spuror rib l6:to fit a notch f in the edge of a specially prepared angle Fwhile its opposite edge is straight to fit the edge of any ordinaryangle when the block is reversed.

The block 15 fits below the arm 9 and has at its top a small projectingportion 16 which passes through the slot 10 and laps against the underside of the arm 13 on opposite sides of the slot 14. The screw shank 17projects up from the clamp block through the slot 14 and is flattened atopposite sides to fit such slot and receives the thumb nut 18 whichturns down against the arm 13 of the clamp section. This arm 13 beingmovable transversely of the holder and being also provided with a slotfor the adjustment of the clamp IOO . V Q I turning the wheel one pointfor each section or thread line such lines may be spaced one one hundredand twenty-eighth of an inch apart, two points will space then onesixtyfourth of an inch apart and so 011. Manifestly the thread or theteeth of the Wheel may be changed to vary the distance the holder willbe moved by the movement of the wheel one step or point.

The use of this improvement will enable an amateur to space the sectionand similar lines with as great accuracy as a skilled, experi- 25 enceddraftsman, and it will be found useful to the skilled draftsman inrapidly drawing the lines without regard to the spacing as theimprovement enables the spacing to be ac- .complished automatically.

It may be stated thatin Fig. 1 the improved devices are shown about onehalf the usual size the usual size of the instrument operating 'to movethe holder and space the lines one sixty-fourth of an inch apart at eachsingle movement of the wheel.

Having thus described my invention, what Iclaim as new, and desire tosecure by Letters Patent, is

1. A draftsmans instrument comprising a base support or rule, an angleholder having a spring actuated clamp section and movable along saidbase support or rule, and devices by which said holder may be movedalong the support or rule substantially as set forth.

2. A draftsmans instrument comprising a base support or rule an angleholder movable along said support and provided with a transverselymovable clamp section by which to secure the angle and a step by stepfeeding mechanism for advancing the holder along the rule substantiallyas set forth.

3. A T square substantially as described having a head and a blade andprovided upon its blade with a j ournaled screw shaft adapted to beturned, and an angle holder movable along the said blade and providedwith a threaded bearing engaging said screw shaft and with a clampsection whereby to secure the angle all substantially as and for thepurposes described.

4. A draftsmans instrument substantially as described comprising a Tsquare having a head and a blade, a screw extended longitudinally overand j ournaled to said blade and an angle holder movable along saidblade and having a threaded connection with the screw whereby theturning of the latter may operate to feed the angle holder along theblade of the T square, substantially as set forth.

5. In a draftsmans instrument substantially as described the combinationwith the base or support and the screw shaft and the angle holder, ofthe segmental nut section hinged to the holder and having a threadedbearing to engage the shaft and a handle portion, and a spring by whichto actuate the threaded portion into engagement with the screw shaftsubstantially as set forth.

6. In a draftsmans instrument substantially as described, thecombination of the base or support, the screw shaft, the angle holderhaving a handle 8, and the nut section hinged at 3 and having a threadedsection e11- gaging the screw shaft and a handle opposite the handle 8and a spring by which to adjust the threaded section into engagementwith the screw shaft substantially as set forth.

7. An improved draftsmans instrument comprising the shaft and the angleholder having a main plate and a transversely movable clamp sectionsubstantially as set forth.

8. Thecombination in a draftsmans instrument, substantially as describedof the angle holder main plate provided with an arm 9 having a slot 10the transversely movable clamp section 13 having a slot 14 in registerwith the slot 10, the spring for actuating said clamp section and theclamp block connected with the clamp section substantially as set forth.

9. The combination in an instrument substantially as described of thebase support or rule the angle holder provided with a transverselymovable spring actuated clamp section and devices for moving the holderalong the base support or rule substantially as set forth.

10. The combination in an instrument substantially as described of thescrew shaft, the angle holder having a tube embracing said shaft andhaving a transversely movable clamp section and the movable nut sectionall substantially as set forth.

11. In a draftsmans instrument substantially as described an angleholder provided with a clamp section having a reversible clamp blocksuch block being straight on one edge and provided on its opposite edgewith a spur or bead substantially as set forth.

ALEXIS F. GILLET.

YVitnesses:

P. B. TURPIN, SoLoN G. KEMON.

IIO

